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This species is accepted, and its native range is Ethiopia to Malawi.
A specimen from Kew's Herbarium

[FTEA]

Cyperaceae, K Hoenselaar, B. Verdcourt & H. Beentje. Hypolytrum, D Simpson. Fuirena, M Muasya. Flora of Tropical East Africa. 2010

Type
Type: Ethiopia, near Mt Silke, Schimper 659 (P, holo.; BR!, HAL, K, iso.)
Morphology General Habit
Perennial, robust, up to 2.25 m tall, with a thick woody rhizome.
Morphology Culms
Culms tufted, 135–200 cm long, 3.5–8 mm wide, trigonous to triquetrous, smooth to sometimes slightly scabrid
Morphology Leaves
Leaves up to 100 cm long. Leaf blade linear, w-shaped or flat, 58–100 cm long, 1.1–2.2 cm wide, scabrid on veins and margins, apex acute to acuminate Leaf sheath not prominent, only seen at the very base of the culm, brown.
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts leaf-like, erect to spreading, 5–9, lowermost 24–85 cm long, 0.7–2.2 cm wide
Morphology Reproductive morphology Inflorescences
Inflorescence a compound anthela, primary branches 6–15, 5–17 cm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets in digitate clusters, at the end of primary, secondary and tertiary branches, (1–)2–6 per cluster, ovoid, 4.3–8 mm long, 1.9–2.5 mm wide, rachilla straight to slightly curved.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reddish-brown, ovate, 2.2–2.7 mm long, 1.1–1.4 mm wide with several veins on either side, keel green, not excurrent, apex rounded
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3.
Morphology Reproductive morphology Flowers Androecium Stamens Filaments
Filaments 1.6–2.7 mm long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 1.3–1.9 mm long
Morphology Reproductive morphology Fruits
Nutlet reddish-brown, ellipsoid-ovoid, 1 mm long, 0.6–0.7 mm wide, almost smooth.
Ecology
In montane and bamboo forests, often in open areas, sometimes in swamp and along streams and river beds; 2100–3050 m
Conservation
Least Concern (LC) due to its wide distribution and habitat
Note
The species is often cited as dereilema, but the protologue spells it as derreilema. I am not sure about the derivation so I am letting the original version stand (HB). This species is related to C. ajax but can be distinguished by its rounded (not mucronate) glume apex.
Distribution
Range: Congo-Kinshasa, Rwanda, Ethiopia, Malawi Flora districts: U1 U2 U3 K3 K4 K6 T2 T7

Native to:

Ethiopia, Kenya, Malawi, Rwanda, Sudan, Tanzania, Uganda, Zambia, Zaïre

Cyperus derreilema Steud. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Schimper [659], Ethiopia K000321367 isotype

First published in Flora 25: 585 (1842)

Accepted by

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
  • Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.
  • Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae Flora of Tropical East Africa: 1-466.
  • Strugnell, A.M. (2006). A checklist of the Spermatophytes of Mt. Mulanje, Malawi Scripta Botanica Belgica 34: 1-199.

Literature

Kew Backbone Distributions

  • Browning, J. & al. (2020). Flora Zambesiaca 14: 1-455. Royal Botanic Gardens, Kew.
  • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.

Flora of Tropical East Africa

  • E.P. 4, 20 (101): 199 (1936), as dereilema
  • F.T.A. 8: 343 (1902)
  • Fl. Eth. 6: 435 (1997).
  • Flora 25: 585 (1842)
  • Haines & Lye, Sedges & Rushes E. Afr.: 155, fig. 285 (1983)

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0